Gas-liquid impact cylinder control device and method

Abstract

The present application discloses a gas-liquid impact cylinder control device and method, which relate to the technical field of impact test equipment. The gas-liquid impact cylinder control device includes a quick-switching valve group, an impact stroke control mechanism, a buffer energy storage component and a hydraulic station. The quick-switching valve group is connected to the rod chamber of the gas-liquid impact cylinder through a control oil circuit. The quick-switching valve group is connected to the impact stroke control mechanism and the buffer energy storage component through a common oil circuit. The hydraulic station can pump hydraulic oil into the rod chamber of the gas-liquid impact cylinder. The quick-switching valve group can control the hydraulic oil in the rod chamber of the gas-liquid impact cylinder to be quickly discharged into the impact stroke control mechanism, thereby accelerating the impact rod to the end position of the impact stroke. After reaching the designed impact speed, the impact rod is instantly forced to decelerate, and the hydraulic oil enters the buffer energy storage component. The impact rod continues to decelerate and stops moving, thereby realizing acceleration, rapid forced deceleration and buffer stop control of the impact rod, and also helping to reduce damage caused by the impact rod to the gas-liquid impact cylinder.

Description

Technical Field

[0001] The present application relates to the technical field of impact test equipment, and in particular to a gas-liquid impact cylinder control device and method. Background Art

[0002] For large-scale, high-speed impact testing equipment, the impact speed is much higher than that of ordinary impactors, and the entire impact stroke is completed in just tens of milliseconds. During the impact test, the gas-liquid impact cylinder needs to start quickly and accelerate to the predetermined design speed at the end of the impact stroke. The impact head needs to automatically disengage from the impact rod at the end of the impact stroke to achieve free impact. After the impact process, the high-speed impact rod needs to be buffered and stopped to avoid damage to the equipment.

[0003] In the limited impact stroke of the gas-liquid high-speed impact system, it is first necessary to connect the rodless chamber of the gas-liquid impact cylinder and the return oil chamber at the moment of startup, so that the high-pressure oil in the rodless chamber of the gas-liquid impact cylinder can be quickly depressurized and discharged. At the same time, the impact rod drives the impact head to quickly extend out under the action of the air pressure in the rodless chamber to start the impact stroke. Since the instantaneous discharge flow of the gas-liquid impact cylinder is huge, the switch valve needs to have a very large flow capacity and fast response time; secondly, the gas-liquid impact system needs to force deceleration control on the impact rod after the impact stroke ends, so that the impact rod suddenly decelerates, and the impact head will separate from the combined moving body of the impact rod and the impact head under the action of inertia force, so as to realize the free impact of the impact head on the specimen; finally, after the forced deceleration, the impact rod needs to continue to decelerate and buffer until it stops, so as to avoid damage to the equipment by impact.

[0004] Current conventional hydraulic control technology does not yet have components and control circuits that can quickly respond to high-speed gas-liquid impact systems and control such large flows. Even if there are oversized control components, their response speed will not be fast. For the impact rod of the gas-liquid impact cylinder that is moving at high speed, it is impossible to control the state change of the combined moving body of the impact rod and the impact head within a time interval of tens of milliseconds, and complete the conversion and implementation of the deceleration buffer function. This is impossible for existing conventional hydraulic control systems. All control circuits, from the issuance, transmission, and reception of signal instructions to the completion of the action of the actuator and the start of the change of state of the hydraulic oil circuit, cannot be completed within a time interval of tens of milliseconds.

[0005] In summary, the existing conventional technology cannot meet the performance parameter, stability and synchronization requirements of the high-speed gas-liquid impact test system. Summary of the Invention

[0006] In order to help improve the control of the motion state of the impact rod, reach the impact speed in a short distance and short time, and realize the conversion and implementation of the deceleration and buffering functions within a very short time interval, the present application provides a gas-liquid impact cylinder control device and method.

[0007] In a first aspect, the present application provides a gas-liquid impact cylinder control device, which adopts the following technical solution:

[0008] A gas-liquid impact cylinder control device includes a quick-switching valve group, an impact stroke control mechanism, a buffer energy storage component and a hydraulic station. The oil inlet of the quick-switching valve group is connected to the rod chamber of the gas-liquid impact cylinder used for impact through a control oil circuit. The oil outlet of the quick-switching valve group is connected to the oil inlet of the impact stroke control mechanism and the oil inlet of the buffer energy storage component through a common oil circuit. The hydraulic station is connected to the control oil circuit.

[0009] By adopting the above technical solution, in the initial state of impact, the rapid switching valve group is in the closed state, the control piston of the impact stroke control mechanism is in the initial limit position of impact, the rear chamber of the control piston is connected to the atmosphere, the buffer energy storage component is in the closed state, and the hydraulic station pumps hydraulic oil to the rod chamber of the gas-liquid impact cylinder to retract the impact rod to the upper limit position and compress the gas in the rodless chamber. The gas-liquid impact cylinder has the impact condition, the impact action starts, the rapid switching valve group opens, and under the push of the compressed gas in the rodless chamber, the hydraulic oil in the rod chamber of the gas-liquid impact cylinder is quickly discharged into the impact stroke control mechanism, pushing the control piston of the impact stroke control mechanism from the initial limit position to the stop limit position, and at the same time the combination of the impact rod and the impact head starts Impact acceleration movement. When the control piston reaches the stop limit position, the combination of the impact rod and the impact head reaches the designed impact speed. Then, the oil pressure in the rod chamber of the gas-liquid impact cylinder rises instantly. When the oil pressure in the rod chamber of the gas-liquid impact cylinder continues to rise to the charging pressure of the buffer energy storage component, the hydraulic oil discharged from the rod chamber of the gas-liquid impact cylinder begins to enter the buffer energy storage component. At the same time, the impact rod is sharply forced to decelerate under the action of oil pressure. The impact head is separated from the combination of the impact rod and the impact head under the action of inertia force, and then moves freely until it hits the test object. The impact rod of the gas-liquid impact cylinder continues to decelerate until the impact rod stops moving, thereby realizing the free impact test of the impact head on the impact rod on the test object and preventing the impact rod from causing impact damage to the gas-liquid impact cylinder.

[0010] Preferably, the quick switching valve group includes one or more parallel two-way cartridge hydraulic valves, and the oil outlet of one or more of the two-way cartridge hydraulic valves is connected to the oil inlet of the impact stroke control mechanism and the oil inlet of the buffer energy storage component through the common oil circuit.

[0011] By adopting the above technical solution, the quick switching valve group is a two-way cartridge hydraulic valve. By configuring one or more parallel two-way cartridge hydraulic valves, the demand for large flow of the gas-liquid impact cylinder can be met, which helps to instantly increase the impact speed of the impact rod.

[0012] Preferably, the impact stroke control mechanism includes one or more parallel-connected positive displacement impact stroke control components, and the oil inlets of the one or more parallel-connected positive displacement impact stroke control components are connected to the common oil circuit.

[0013] By adopting the above technical solution, the oil inlet of the volumetric impact stroke control component is connected to the common oil circuit, which can quickly accommodate the hydraulic oil discharged from the gas-liquid impact cylinder. After the volumetric impact stroke control component accommodates an equal volume of hydraulic oil discharged by the impact stroke of the gas-liquid impact cylinder, the impact rod is accelerated to the impact speed. Because the volumetric impact stroke control component can no longer accommodate hydraulic oil, the back pressure of the rod chamber of the gas-liquid impact cylinder increases. The impact rod suddenly decelerates under the action of the sharp increase in back pressure, which helps to cause the impact head to detach from the impact rod due to inertia, and then freely impact the test object.

[0014] Preferably, the volumetric impact stroke control component includes a control cylinder body, a control piston sliding in the control cylinder body, a guide seal arranged between the inner wall of the control cylinder body and the outer wall of the control piston, a flange installed at one end of the control cylinder body, a limiting ring installed at the end of the control cylinder body away from the flange, and a buffer pad arranged in the inner hole of the limiting ring, the inner hole of the flange is connected to the oil outlet of the fast switching valve group, the end of the buffer pad away from the control piston is in contact with the bottom of the control cylinder body, and a through hole is opened on the bottom of the control cylinder body, and the through hole is connected to a reset assembly for resetting the control piston.

[0015] By adopting the above technical solution, before the impact begins, the reset assembly pushes the control piston to reset to the initial limit position of the control cylinder body near one end of the flange. When the impact rod accelerates, since the rear cavity of the control cylinder body is connected to the atmosphere through the through hole, the control piston moves from the initial limit position to the stop limit position under the push of the hydraulic oil, so that the control cylinder body can be quickly filled with the hydraulic oil discharged from the gas-liquid impact cylinder, and the impact rod is accelerated to the designed impact speed. Since the volumetric impact stroke control assembly can no longer accommodate the hydraulic oil, the back pressure of the rod cavity of the gas-liquid impact cylinder increases, and the impact rod suddenly decelerates under the action of the sharp increase in back pressure, thereby realizing the sharp pressure increase and deceleration function of the impact rod.

[0016] Preferably, the reset component includes a first pneumatic electromagnetic reversing valve, which is connected to the through hole. When the control piston needs to be reset to the initial limit position, the first pneumatic electromagnetic reversing valve connects the through hole to the external pressure air source; when the control piston needs to start running from the initial limit position to the stop limit position, the first pneumatic electromagnetic reversing valve connects the through hole to the external atmospheric pressure.

[0017] By adopting the above technical solution, the through hole is connected to the external pressure gas source or the external atmospheric pressure through the first gas electromagnetic reversing valve, so that the control piston is reset or the control piston is put into impact operation state, and the control piston can be quickly switched between the stop limit position and the initial limit position, thereby improving the working efficiency of the volumetric impact stroke control component.

[0018] Preferably, the reset assembly includes a reset cylinder, which includes a reset cylinder body and a reset piston rod. When the reset piston rod extends out of the reset cylinder body, it can pass through the through hole and form an exhaust channel between the reset piston rod and the through hole. When the control piston is in the stop limit position, the reset piston rod is retracted into the position inside the reset cylinder body. When the reset piston rod is extended, the reset piston rod pushes the control piston to move from the stop limit position to the initial limit position.

[0019] By adopting the above technical solution, the reset cylinder passes through the through hole through the reset piston rod, and an exhaust channel is formed between the reset cylinder and the through hole, so that the rear chamber of the control piston is connected to the atmosphere. In this way, when the reset piston rod is extended, it pushes the control piston from the stop limit position to the impact initial limit position for reset. When preparing for impact, the reset piston rod retracts into the reset cylinder body, and the rear chamber of the control piston is connected to the atmosphere through the through hole, which helps to reduce the resistance of the hydraulic oil discharged from the front chamber of the control piston, thereby increasing the impact speed of the impact rod. When the control piston reaches the stop limit position, it can block the hydraulic oil in the rod chamber of the impact rod from continuing to enter the volumetric impact stroke control assembly, causing the oil pressure to rise sharply, thereby forcing the impact rod to decelerate, separating the impact rod from the impact head, and realizing the impact test of the impact head on the test piece.

[0020] Preferably, the reset cylinder is an air cylinder or a hydraulic cylinder. When the reset cylinder is the air cylinder, the cylinder is connected to the power air source and the atmosphere respectively through the second air electromagnetic reversing valve; when the reset cylinder is the hydraulic cylinder, the hydraulic cylinder is connected to the hydraulic oil source or the oil tank of the hydraulic station through the first electromagnetic reversing valve.

[0021] By adopting the above technical solution, the reset cylinder is a pneumatic cylinder or a hydraulic cylinder, and the piston rod of the pneumatic cylinder or the hydraulic cylinder directly drives the control piston to move from the stop limit position to the initial limit position for reset, thereby improving the reliability of reset.

[0022] Preferably, the hydraulic station includes a hydraulic pump, a second solenoid reversing valve, a third solenoid reversing valve and the oil tank, the hydraulic pump is connected to the control oil circuit through the second solenoid reversing valve, the oil inlet of the third solenoid reversing valve is connected to the common oil circuit, and the oil outlet of the third solenoid reversing valve is connected to the oil tank.

[0023] By adopting the above technical solution, the hydraulic pump pumps hydraulic oil to the control oil circuit through the control of the second electromagnetic reversing valve, providing the hydraulic power for the gas-liquid impact cylinder to retract the impact rod to the upper limit position. The oil inlet of the third electromagnetic reversing valve is connected to the common oil circuit, and the oil outlet is connected to the oil tank, which facilitates the return of the hydraulic oil in the volumetric impact stroke control component and the buffer energy storage component to the oil tank.

[0024] Preferably, the hydraulic station further includes a safety valve, and the hydraulic pump is connected to the oil tank via the safety valve.

[0025] By adopting the above technical solution, the hydraulic pump pumps hydraulic oil into the rod chamber of the gas-liquid impact cylinder. When the hydraulic oil pumped by the hydraulic pump is higher than the set pressure of the safety valve, the safety valve opens and discharges the hydraulic oil into the oil tank, which plays an overload protection role for the hydraulic system and helps to improve the reliability and safety of the hydraulic station.

[0026] In a second aspect, the present application provides a gas-liquid impact cylinder control method, which adopts the following technical solution:

[0027] A gas-liquid impact cylinder control method, based on the above-mentioned gas-liquid impact cylinder control device, comprises the following steps:

[0028] S1. The fast switching valve group is in a locked state, the control piston of the volumetric impact stroke control assembly is in the initial limit position, the through hole is connected to the atmosphere, and the buffer energy storage assembly is closed;

[0029] S2. Hydraulic oil is pumped into the rod chamber of the gas-liquid impact cylinder. The impact rod retracts to compress the gas in the impact energy storage container connected to the rodless chamber. When the impact rod is at the upper limit position, the hydraulic oil pumping is stopped.

[0030] S3. The rapid switching valve assembly is opened, and the hydraulic oil discharged from the rod chamber of the gas-liquid impact cylinder enters the positive displacement impact stroke control assembly through the rapid switching valve assembly, pushing the control piston away from the initial limit position and moving toward the stop limit position. The impact rod begins to accelerate under the action of the air pressure in the impact energy storage container. When the control piston reaches the limit stop limit position, the impact rod accelerates to the designed impact speed;

[0031] S4. When the control piston reaches the stop limit position, the hydraulic oil in the rod chamber of the gas-liquid impact cylinder is prevented from continuing to enter the positive displacement impact stroke control assembly, causing the oil pressure in the rod chamber of the gas-liquid impact cylinder to increase sharply, thereby forcibly decelerating the impact rod. The impact head, under the action of inertia, separates from the impact rod and impact head combination and then moves freely until it impacts the test object;

[0032] S5. When the oil pressure at the outlet of the rapid switching valve group exceeds the preset pressure, the buffer energy storage assembly automatically opens and enters the hydraulic oil, and the impact rod buffer decelerates until it stops near the lower limit position;

[0033] S6. Before preparing for the next cycle of impact work, the control piston is reset to the initial limit position, the hydraulic oil in the volumetric impact stroke control component and the buffer energy storage component is discharged into the oil tank, and the through hole is connected to the atmosphere.

[0034] By adopting the above technical solution, the control method pumps hydraulic oil into the rod chamber of the gas-liquid impact cylinder, and the impact rod retracts to compress the gas in the impact energy storage container connected to the rodless chamber. The rapid switching valve group can control the hydraulic oil in the rod chamber of the gas-liquid impact cylinder to be quickly discharged into the impact stroke control mechanism, thereby accelerating the impact rod to the end position of the impact stroke. After reaching the designed impact speed, the impact rod is instantly forced to decelerate, and the hydraulic oil enters the buffer energy storage component. The impact rod continues to decelerate and stop moving, thereby realizing acceleration and rapid forced deceleration control of the impact rod, and also helps to reduce the damage caused by the impact rod to the gas-liquid impact cylinder.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] 1. Through the control of the control device, the acceleration, deceleration, impact and impact rod buffering required in the impact process of a large-flow gas-liquid system can be completed in a very short time at high speed on a limited-stroke impact test device. This series of non-active operation control can be implemented in tens of milliseconds during the high-speed movement process of the gas-liquid impact cylinder within a limited stroke, solving technical problems that are difficult to solve with conventional technical solutions.

[0037] 2. The fast switching valve group is a two-way cartridge hydraulic valve. By configuring one or more parallel two-way cartridge hydraulic valves, it can meet the large flow requirements of the gas-liquid impact cylinder and help to instantly increase the impact speed of the impact rod;

[0038] 3. When the positive displacement impact stroke control assembly can quickly accommodate the same volume of hydraulic oil discharged by the impact stroke of the gas-liquid impact cylinder, the impact rod is quickly accelerated to the impact speed. The positive displacement impact stroke control assembly filled with hydraulic oil can no longer accommodate hydraulic oil, which increases the back pressure of the rod chamber of the gas-liquid impact cylinder. The impact rod suddenly decelerates under the action of the sharp increase in back pressure, which helps to separate the impact head from the impact rod due to inertia and impact the test object.

[0039] 4. The buffer energy storage assembly includes one or more parallel buffer energy storage devices. When the oil pressure at the outlet of the rapid switching valve group is higher than the preset pressure, the buffer energy storage assembly automatically opens and hydraulic oil enters, causing the impact rod to slow down until it stops near the lower limit position, which helps to reduce the impact of the impact rod on the impact cylinder.

[0040] 5. The hydraulic pump pumps hydraulic oil to the control oil circuit through the control of the second electromagnetic reversing valve, providing the hydraulic power for the gas-liquid impact cylinder to retract the impact rod to the upper limit position and compress the gas in the rodless chamber. The third electromagnetic reversing valve facilitates the return of the hydraulic oil in the volumetric impact stroke control component and the buffer energy storage component to the oil tank.

[0041] 6. The gas-liquid impact cylinder control device can control the impact rod of the gas-liquid impact cylinder to achieve the acceleration, forced deceleration, buffer stop and other functions required for the high-speed impact process, providing a solution for non-active operation control of the impact process of the impact rod. It is simple, reliable, practical and economical, and completes the control functions and technical difficulties that are difficult to achieve with conventional technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic structural diagram of a gas-liquid impact cylinder disclosed in this application;

[0043] Figure 2 for Figure 1 The partial enlarged view at position I in the middle is used to show the structural schematic diagram of the gas-liquid impact cylinder control device;

[0044] Figure 3 This is a structural diagram of a volumetric impact stroke control assembly disclosed in the first embodiment, in which the reset cylinder is a pneumatic cylinder;

[0045] Figure 4 This is a structural diagram of a volumetric impact stroke control assembly in which the reset cylinder disclosed in the first embodiment is a hydraulic cylinder;

[0046] Figure 5 This is a structural diagram of a volumetric impact stroke control component of a first gas electromagnetic reversing valve in which the reset component disclosed in the second embodiment is a first gas electromagnetic reversing valve.

[0047] Description of reference numerals:

[0048] 1. Fast-switching valve group; 11. Two-way cartridge hydraulic valve; 2. Impact stroke control mechanism; 21. Positive displacement impact stroke control assembly; 211. Control cylinder; 2111. Through hole; 212. Control piston; 213. Guide seal; 214. Flange; 215. Limiting ring; 216. Buffer; 217. Reset assembly; 2171. First gas-use electromagnetic reversing valve; 2172. Reset cylinder; 21721. Reset cylinder; 21722. Reset Piston rod; 2173, first solenoid reversing valve; 2174, second pneumatic solenoid reversing valve; 3, buffer energy storage assembly; 31, buffer energy accumulator; 4, hydraulic station; 41, hydraulic pump; 42, second solenoid reversing valve; 43, third solenoid reversing valve; 44, safety valve; 45, oil tank; 5, control oil circuit; 6, common oil circuit; 100, gas-liquid impact cylinder; 101, impact cylinder body; 102, impact energy storage container; 103, impact rod; 104, impact head. DETAILED DESCRIPTION

[0049] The following combination Figures 1 to 5 This application is described in further detail.

[0050] The embodiment of the present application discloses a gas-liquid impact cylinder control device. Example

[0051] A gas-liquid impact cylinder control device, referring to Figure 1 and Figure 2It should be noted that the control device of the embodiment of the present application controls a gas-liquid impact cylinder 100, which includes an impact cylinder body 101, an impact energy storage container 102 arranged at one end of the impact cylinder body 101, an impact rod 103 slidingly arranged with the impact cylinder body 101, and an impact head 104 fixed to the end of the impact rod 103 away from the impact energy storage container 102. The impact energy storage container 102 is pre-filled with compressed inert gas; at the end of the impact cylinder body 101 close to the impact energy storage container 102, the limit position of the movement of the impact rod 103 is the upper limit position, and the limit position of the movement of the impact rod 103 at the other end is the lower limit position. An acceleration stroke section and a buffer stroke section are sequentially arranged from the upper limit position to the lower limit position, and the impact is ended from the upper limit position to the acceleration stroke section. The impact rod 103 is accelerated to the designed impact speed, and the impact rod 103 is buffered and decelerated in the buffer stroke section until it stops; the control device of the embodiment of the present application includes a fast switching valve group 1, an impact stroke control mechanism 2, a buffer energy storage component 3 and a hydraulic station 4, the oil inlet of the fast switching valve group 1 is connected to the rod chamber of the gas-liquid impact cylinder 100 used for impact through a control oil circuit 5, the oil outlet of the fast switching valve group 1 is connected to the oil inlet of the impact stroke control mechanism 2 and the oil inlet of the buffer energy storage component 3 through a common oil circuit 6, the hydraulic station 4 is connected to the control oil circuit 5, and the buffer energy storage component 3 includes one or more parallel buffer accumulators 31, the buffer accumulator 31 can be a bladder accumulator or a piston accumulator, and the buffer accumulator 31 is pre-filled with an inert gas of a certain pressure;It should be noted that the specific connecting oil circuit structure between the fast switching valve group 1, the impact stroke control mechanism 2, the buffer energy storage component 3 and the hydraulic station 4 can be directly connected by pipeline, or an oil circuit block can be set, and a connecting oil circuit is set on the oil circuit block. The fast switching valve group 1, the impact stroke control mechanism 2 and the buffer energy storage component 3 are installed on the oil circuit block, and the hydraulic station 4 is connected to the oil circuit block to realize the oil circuit communication between the components. The specific structure of the embodiment of this application is not specifically limited. Any structure that can meet the connection relationship can be used. In this way, in the initial state of the impact Under the action of the impact stroke control mechanism 2, the quick switch valve group 1 is in the closed state, the control piston 212 of the impact stroke control mechanism 2 is in the initial impact limit position, the rear cavity of the control piston 212 is connected to the atmosphere, the buffer energy storage component 3 is in the closed state, and the hydraulic station 4 pumps hydraulic oil into the rod cavity of the gas-liquid impact cylinder 100 to retract the impact rod 103 to the upper limit position and compress the gas in the rodless cavity. The gas-liquid impact cylinder 100 has the impact condition and the impact action starts. The quick switch valve group 1 is opened, and the hydraulic oil in the rod cavity of the gas-liquid impact cylinder 100 is pushed by the compressed gas in the rodless cavity. The oil pressure in the rod chamber of the gas-liquid impact cylinder 100 rises instantly. When the oil pressure in the rod chamber of the gas-liquid impact cylinder 100 continues to rise to the inflation pressure of the buffer energy storage component 3, the gas-liquid impact cylinder 100 is in a state of shock. The hydraulic oil discharged from the rod chamber of the impact cylinder 100 begins to enter the buffer energy storage assembly 3. At the same time, the impact rod 103 is rapidly decelerated under the action of the oil pressure. The impact head 104, under the action of inertia, separates from the impact rod 103 and impact head 104 combination and then moves freely until it strikes the test object. The impact rod 103 of the gas-liquid impact cylinder 100 continues to decelerate until the impact rod 103 stops moving, completing the free impact test of the impact head 104 on the impact rod 103 and the test object. At the same time, the impact rod 103 is prevented from causing impact damage to the gas-liquid impact cylinder 100.

[0052] Reference Figure 1 and Figure 2The quick switching valve group 1 includes one or more parallel two-way cartridge hydraulic valves 11, and the oil outlet of one or more two-way cartridge hydraulic valves 11 is connected to the oil inlet of the impact stroke control mechanism 2 and the oil inlet of the buffer energy storage component 3 through a common oil circuit 6. It should be noted that the specific structure of the common oil circuit 6 connecting the two-way cartridge hydraulic valve 11, the impact stroke control mechanism 2 and the buffer energy storage component 3 can be directly connected through a pipeline, or by configuring an oil circuit block, setting a connecting oil circuit on the oil circuit block, and then connecting and installing the two-way cartridge hydraulic valve 11, the impact stroke control mechanism 2 and the buffer energy storage component 3 on the oil circuit block to achieve communication therebetween. The quick switching valve group 1 in the embodiment of the present application is one or more parallel two-way cartridge hydraulic valves 11. By configuring one or more parallel two-way cartridge hydraulic valves 11, it can meet the demand of the gas-liquid impact cylinder 100 for large flow, which helps to instantly increase the impact speed of the impact rod 103.

[0053] Reference Figure 1 and Figure 2 The impact stroke control mechanism 2 includes one or more parallel positive displacement impact stroke control components 21. The oil inlets of the one or more parallel positive displacement impact stroke control components 21 are connected to the common oil circuit 6, and can quickly accommodate the hydraulic oil discharged from the gas-liquid impact cylinder 100. After the positive displacement impact stroke control component 21 accommodates an equal volume of hydraulic oil discharged by the impact stroke of the gas-liquid impact cylinder 100, the impact rod 103 is accelerated to the designed impact speed. Because the positive displacement impact stroke control component 21 can no longer accommodate hydraulic oil, the back pressure of the rod chamber of the gas-liquid impact cylinder 100 increases. The impact rod 103 suddenly decelerates under the action of the sharp increase in back pressure, which helps to make the impact head 104 detach from the impact rod 103 due to inertia, and then freely impact the test object.

[0054] Reference Figure 1 and Figure 2The volumetric impact stroke control assembly 21 includes a control cylinder 211, a control piston 212, a guide seal 213, a flange 214, a limit ring 215 and a buffer pad 216. A sealing ring groove is provided on the circumference of the control piston 212, and the guide seal 213 is installed in the sealing ring groove. The control piston 212 is slidably connected to the inner wall of the control cylinder 211 through the guide seal 213. The flange 214 is installed at one end of the control cylinder 211, and the limit ring 215 is installed in the control cylinder 21 A buffer pad 216 is fixedly installed in the inner hole of the limit ring 215 at the end away from the flange 214. The end of the buffer pad 216 away from the control piston 212 abuts against the bottom of the control cylinder 211. The buffer pad 216 is made of polyurethane material. The buffer pad 216 made of polyurethane material can effectively cushion the control piston 212 and at the same time increase the service life of the buffer pad 216. A through hole 2111 is opened on the bottom of the control cylinder 211. The buffer pad 216 A through hole is provided at a position relative to the through hole 2111, the inner hole of the flange 214 is connected to the oil outlet of the fast switching valve group 1, and the through hole 2111 is connected to the reset component 217 for resetting the control piston 212; before the impact begins, the reset component 217 pushes the control piston 212 to reset to the initial limit position of the control cylinder body 211 near one end of the flange 214. When the impact rod 103 accelerates, since the rear cavity of the control cylinder body 211 is connected to the atmosphere through the through hole 2111, the control piston 212 moves from the initial limit position to the stop limit position under the push of the hydraulic oil, so that the control cylinder body 211 can quickly receive the hydraulic oil discharged from the gas-liquid impact cylinder 100, and the impact rod 103 is accelerated to the designed impact speed. Since the volumetric impact stroke control component 21 can no longer accommodate hydraulic oil, the back pressure of the rod cavity of the gas-liquid impact cylinder 100 increases, and the impact rod 103 suddenly decelerates under the action of the sharp increase in back pressure, realizing the sharp pressure increase and deceleration function of the impact rod 103.

[0055] Reference Figure 3The reset assembly 217 includes a reset cylinder 2172, which includes a reset cylinder body 21721 and a reset piston rod 21722. When the reset piston rod 21722 extends out of the reset cylinder body 21721, it can pass through the through hole 2111 and form an exhaust channel between the reset piston rod 21722 and the through hole 2111. When the control piston 212 is at the stop limit position, the reset piston rod 21722 is retracted into the reset cylinder body 21721. When the reset piston rod 21722 extends out, the reset piston rod 21722 is 722 pushes the control piston 212 to move from the stop limit position to the initial limit position, and the reset cylinder 2172 passes through the through hole 2111 through the reset piston rod 21722, and forms an exhaust channel with the through hole 2111, so that the rear cavity of the control piston 212 is connected to the atmosphere. It should be noted that the installation structure of the reset cylinder 2172 and the volumetric impact stroke control component 21 can be that the reset cylinder 2172 is directly installed on the control cylinder body 211 of the volumetric impact stroke control component 21, or it can be a reset cylinder 2172 installed on the control cylinder body 211 of the volumetric impact stroke control component 21. The position cylinder 2172 is installed on the frame of the equipment or on the oil circuit block. Any installation structure that satisfies the requirement that the reset piston rod 21722 can pass through the through hole 2111 and can realize the reset function of the control piston 212 is acceptable. In this way, when the reset piston rod 21722 is extended, it pushes the control piston 212 to move from the stop limit position to the impact initial limit position for reset. When preparing for impact, the reset piston rod 21722 retracts into the reset cylinder body 21721, and the rear cavity of the control piston 212 is connected to the atmosphere through the through hole 2111, which helps to reduce the resistance of the front cavity of the control piston 212 to discharge hydraulic oil, thereby increasing the impact speed of the impact rod 103. When the control piston 212 reaches the stop limit position, it can block the hydraulic oil in the rod cavity of the impact rod 103 from continuing to enter the volumetric impact stroke control assembly 21, causing the oil pressure to rise sharply, thereby forcing the impact rod 103 to decelerate, separating the impact rod 103 from the impact head 104, and realizing the impact test of the impact head 104 on the test piece.

[0056] Reference Figure 3 and Figure 4 The reset cylinder 2172 is an air cylinder or a hydraulic cylinder. When the reset cylinder 2172 is an air cylinder, the cylinder is connected to the power air source and the atmosphere respectively through the second air electromagnetic reversing valve 2174; when the reset cylinder 2172 is a hydraulic cylinder, the hydraulic cylinder is connected to the hydraulic oil source or the oil tank 45 of the hydraulic station 4 through the first electromagnetic reversing valve 2173. The reset cylinder 2172 is an air cylinder or a hydraulic cylinder, and the piston rod of the air cylinder or the piston rod of the hydraulic cylinder directly drives the control piston 212 to move from the stop limit position to the initial limit position for reset, thereby improving the reliability of reset.

[0057] Reference Figure 2The hydraulic station 4 includes a hydraulic pump 41, a second electromagnetic reversing valve 42, a third electromagnetic reversing valve 43 and an oil tank 45. The hydraulic pump 41 is connected to the control oil circuit 5 through the second electromagnetic reversing valve 42, the oil inlet of the third electromagnetic reversing valve 43 is connected to the common oil circuit 6, and the oil outlet of the third electromagnetic reversing valve 43 is connected to the oil tank 45. The hydraulic pump 41 pumps hydraulic oil to the control oil circuit 5 under the control of the second electromagnetic reversing valve 42, providing the hydraulic power for the gas-liquid impact cylinder 100 to retract the impact rod 103 to the upper limit position. The oil inlet of the third electromagnetic reversing valve 43 is connected to the common oil circuit 6, and the oil outlet is connected to the oil tank 45, so as to facilitate returning the hydraulic oil in the volumetric impact stroke control component 21 and the buffer energy storage component 3 to the oil tank 45.

[0058] Reference Figure 2 The hydraulic station 4 also includes a safety valve 44. The hydraulic pump 41 is connected to the oil tank 45 through the safety valve 44. The hydraulic pump 41 pumps hydraulic oil to the rod chamber of the gas-liquid impact cylinder 100. When the hydraulic oil pumped by the hydraulic pump 41 is higher than the set pressure of the safety valve 44, the safety valve 44 opens and discharges the hydraulic oil into the oil tank 45, which plays an overload protection role for the hydraulic system and helps to improve the reliability and safety of the hydraulic station 4. Example

[0059] The difference between the second embodiment of the present application and the first embodiment is that, referring to Figure 3 and Figure 5 The reset component 217 includes a first gas electromagnetic reversing valve 2171, which is connected to the through hole 2111. When the control piston 212 needs to be reset to the initial limit position, the first gas electromagnetic reversing valve 2171 connects the through hole 2111 with the external pressure gas source; when the control piston 212 needs to start running from the initial limit position to the stop limit position, the first gas electromagnetic reversing valve 2171 connects the through hole 2111 with the external atmospheric pressure. The through hole 2111 is connected to the external pressure gas source or the external atmospheric pressure through the first gas electromagnetic reversing valve 2171, so that the control piston 212 is reset or the control piston 212 is put into impact operation state, which can enable the control piston 212 to quickly switch between the stop limit position and the initial limit position, thereby improving the working efficiency of the volumetric impact stroke control component 21.

[0060] The present application also discloses a method for controlling a gas-liquid impact cylinder, which is based on the above-mentioned gas-liquid impact cylinder control device and includes the following steps:

[0061] S1. The fast switching valve group 1 is in the locked state, the volumetric impact stroke control component 21 of the control piston 212 is in the initial limit position, the through hole 2111 is connected to the atmosphere, and the buffer energy storage component 3 is closed;

[0062] S2. Hydraulic oil is pumped into the rod chamber of the gas-liquid impact cylinder 100, and the impact rod 103 retracts so that the gas in the impact energy storage container 102 communicating with the rodless chamber is compressed. When the impact rod 103 is located at the upper limit position, the hydraulic oil is stopped from being pumped;

[0063] S3. Open the rapid switching valve assembly 1. The hydraulic oil discharged from the rod chamber of the gas-liquid impact cylinder 100 enters the positive displacement impact stroke control assembly 21 through the rapid switching valve assembly 1, pushing the control piston 212 away from the initial limit position and moving toward the stop limit position. The impact rod 103 begins to accelerate under the action of the air pressure in the impact energy storage container 102. When the control piston 212 reaches the stop limit position, the impact rod 103 accelerates to the designed impact speed.

[0064] S4. When the control piston 212 reaches the stop limit position, the hydraulic oil in the rod chamber of the gas-liquid impact cylinder 100 is prevented from continuing to enter the positive displacement impact stroke control assembly 21, causing the oil pressure in the rod chamber of the gas-liquid impact cylinder 100 to rise sharply, thereby forcibly decelerating the impact rod 103. The impact head 104, under the action of inertia, separates from the impact rod 103 and impact head 104 combination and then moves freely until it strikes the test object.

[0065] S5. When the oil pressure at the outlet of the fast switching valve assembly 1 is higher than the preset pressure, the buffer energy storage assembly 3 automatically opens and enters the hydraulic oil, and the impact rod 103 buffers and decelerates until it stops near the lower limit position;

[0066] S6. Before preparing for the next cycle of impact work, the control piston 212 is reset to the initial limit position, the hydraulic oil in the volumetric impact stroke control component 21 and the buffer energy storage component 3 is discharged into the oil tank 45, and the through hole 2111 is connected to the atmosphere.

[0067] The control method pumps hydraulic oil into the rod chamber of the gas-liquid impact cylinder 100, and the impact rod 103 retracts to compress the gas in the impact energy storage container 102 connected to the rodless chamber. The rapid switching valve group 1 can control the hydraulic oil in the rod chamber of the gas-liquid impact cylinder 100 to be quickly discharged into the impact stroke control mechanism 2, thereby accelerating the impact rod 103 to the end position of the impact stroke. After reaching the designed impact speed, the impact rod 103 is instantly forced to decelerate, and the hydraulic oil enters the buffer energy storage component 3. The impact rod 103 continues to decelerate and stops moving, thereby realizing acceleration and rapid forced deceleration control of the impact rod 103, and also helping to reduce damage caused by the impact rod 103 to the gas-liquid impact cylinder 100.

[0068] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A gas-liquid impact cylinder control device, characterized in that: The invention comprises a fast switching valve group (1), an impact stroke control mechanism (2), a buffer energy storage component (3) and a hydraulic station (4); the oil inlet of the fast switching valve group (1) is connected to the rod chamber of a gas-liquid impact cylinder (100) for impact through a control oil circuit (5); the oil outlet of the fast switching valve group (1) is connected to the oil inlet of the impact stroke control mechanism (2) and the oil inlet of the buffer energy storage component (3) through a common oil circuit (6); and the hydraulic station (4) is connected to the control oil circuit (5); The impact stroke control mechanism (2) includes one or more parallel-connected positive displacement impact stroke control components (21), and the oil inlets of the one or more parallel-connected positive displacement impact stroke control components (21) are connected to the common oil circuit (6); The volumetric impact stroke control assembly (21) comprises a control cylinder (211), a control piston (212) sliding in the control cylinder (211), a guide seal (213) arranged between the inner wall of the control cylinder (211) and the outer wall of the control piston (212), a flange (214) installed at one end of the control cylinder (211), a limiting ring (215) installed at the end of the control cylinder (211) away from the flange (214), and a guide seal (213) arranged at the inner wall of the control cylinder (211) and the outer wall of the control piston (212). A buffer pad (216) is disposed in the inner hole of the limiting ring (215), and the inner hole of the flange (214) is connected to the oil outlet of the fast switching valve group (1). One end of the buffer pad (216) away from the control piston (212) is in contact with the bottom of the control cylinder body (211). A through hole (2111) is provided on the bottom of the control cylinder body (211), and the through hole (2111) is connected to a reset component (217) for resetting the control piston (212).

2. A gas-liquid impact cylinder control device according to claim 1, characterized in that: The fast switching valve group (1) comprises one or more parallel two-way plug-in hydraulic valves (11), and the oil outlets of the one or more two-way plug-in hydraulic valves (11) are connected to the oil inlet of the impact stroke control mechanism (2) and the oil inlet of the buffer energy storage component (3) through the common oil circuit (6).

3. The gas-liquid impact cylinder control device according to claim 1, characterized in that: The reset assembly (217) includes a first gas electromagnetic reversing valve (2171), which is connected to the through hole (2111). When the control piston (212) needs to be reset to the initial limit position, the first gas electromagnetic reversing valve (2171) connects the through hole (2111) to an external pressure gas source; when the control piston (212) needs to start running from the initial limit position to the stop limit position, the first gas electromagnetic reversing valve (2171) connects the through hole (2111) to the external atmospheric pressure.

4. The gas-liquid impact cylinder control device according to claim 1, characterized in that: The reset assembly (217) includes a reset cylinder (2172), and the reset cylinder (2172) includes a reset cylinder body (21721) and a reset piston rod (21722). When the reset piston rod (21722) extends out of the reset cylinder body (21721), it can pass through the through hole (2111) and form an exhaust channel between the reset piston rod (21722) and the through hole (2111). When the control piston (212) is in the stop limit position, the reset piston rod (21722) is in a position retracted into the reset cylinder body (21721). When the reset piston rod (21722) extends out, the reset piston rod (21722) pushes the control piston (212) to move from the stop limit position to the initial limit position.

5. The gas-liquid impact cylinder control device according to claim 4, characterized in that: The reset cylinder (2172) is an air cylinder or a hydraulic cylinder. When the reset cylinder (2172) is an air cylinder, the cylinder is connected to the power gas source and the atmosphere respectively through the second air electromagnetic reversing valve (2174); when the reset cylinder (2172) is a hydraulic cylinder, the hydraulic cylinder is connected to the hydraulic oil source or the oil tank (45) of the hydraulic station (4) through the first electromagnetic reversing valve.

6. The gas-liquid impact cylinder control device according to claim 5, characterized in that: The hydraulic station (4) comprises a hydraulic pump (41), a second electromagnetic reversing valve (42), a third electromagnetic reversing valve (43) and the oil tank (45); the hydraulic pump (41) is connected to the control oil circuit (5) via the second electromagnetic reversing valve (42); the oil inlet of the third electromagnetic reversing valve (43) is connected to the common oil circuit (6); and the oil outlet of the third electromagnetic reversing valve (43) is connected to the oil tank (45).

7. The gas-liquid impact cylinder control device according to claim 6, characterized in that: The hydraulic station (4) further comprises a safety valve (44), and the hydraulic pump (41) is connected to the oil tank (45) via the safety valve (44).

8. A gas-liquid impact cylinder control method, based on the gas-liquid impact cylinder control device according to any one of claims 5 to 7, characterized in that: The following steps are involved: S1. The fast switching valve assembly (1) is in a locked state, the control piston (212) of the volumetric impact stroke control assembly (21) is in an initial limit position, the through hole (2111) is connected to the atmosphere, and the buffer energy storage assembly (3) is closed; S2. Hydraulic oil is pumped into the rod chamber of the gas-liquid impact cylinder (100). The impact rod (103) retracts to compress the gas in the impact energy storage container (102) connected to the rodless chamber. When the impact rod (103) is at the upper limit position, the hydraulic oil is stopped from being pumped. S3. The rapid switching valve group (1) is opened, and the hydraulic oil discharged from the rod chamber of the gas-liquid impact cylinder (100) enters the volumetric impact stroke control assembly (21) through the rapid switching valve group (1), pushing the control piston (212) away from the initial limit position and moving toward the stop limit position. The impact rod (103) begins to accelerate under the action of the air pressure in the impact energy storage container (102). When the control piston (212) reaches the stop limit position, the impact rod (103) accelerates to the designed impact speed. S4. When the control piston (212) reaches the stop limit position, the hydraulic oil in the rod chamber of the gas-liquid impact cylinder (100) is prevented from continuing to enter the volumetric impact stroke control assembly (21), causing the oil pressure in the rod chamber of the gas-liquid impact cylinder (100) to increase sharply, thereby forcing the impact rod (103) to decelerate, and the impact head (104) is separated from the combination of the impact rod and the impact head under the action of inertia force, and then moves freely until it hits the test object; S5. When the oil pressure at the oil outlet of the fast switching valve assembly (1) is higher than the preset pressure, the buffer energy storage assembly (3) automatically opens and hydraulic oil enters, and the impact rod (103) buffers and decelerates until it stops near the lower limit position; S6. Before preparing for the next cycle of impact work, the control piston (212) is reset to the initial limit position, the hydraulic oil in the volumetric impact stroke control component (21) and the buffer energy storage component (3) is discharged into the oil tank (45), and the through hole (2111) is connected to the atmosphere.

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